• Maritime moderation is weakening — projected mid-century warming here exceeds 4 °C under SSP3-7.0, with sea-surface temperatures in the southern Gulf rising faster than the global mean.
• Red spruce + balsam fir + paper birch (the cold-end Acadian conifer signature) are contracting at the southern edge of their range; oak + maple associations are advancing.
• Garden-relevant: heritage Maritime varieties (apple, pear, cold-hardy Asiatic plum) gain hardiness margin, but the binding constraints shift toward late-spring frost variability + summer drought rather than winter cold.